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On Tuza’s conjecture for triangulations and graphs with small treewidth
Discrete Mathematics ( IF 0.7 ) Pub Date : 2021-01-23 , DOI: 10.1016/j.disc.2020.112281
Fábio Botler , Cristina G. Fernandes , Juan Gutiérrez

Tuza (1981) conjectured that the size τ(G) of a minimum set of edges that intersects every triangle of a graph G is at most twice the size ν(G) of a maximum set of edge-disjoint triangles of G. In this paper we present three results regarding Tuza’s Conjecture. We verify it for graphs with treewidth at most 6; we show that τ(G)32ν(G) for every planar triangulation G different from K4; and that τ(G)95ν(G)+15 if G is a maximal graph with treewidth 3. Our first result strengthens a result of Tuza, implying that τ(G)2ν(G) for every K8-free chordal graph G.



中文翻译:

关于图萨猜想的三角形和具有小树宽的图

Tuza(1981)推测 τG 与图的每个三角形相交的最小边的集合 G 最多是尺寸的两倍 νG 的最大边不相交三角形的集合 G。在本文中,我们提出了关于图扎猜想的三个结果。我们对树宽最大为6的图进行验证。我们表明τG32νG 对于每个平面三角剖分 G 不同于 ķ4; 然后τG95νG+1个5 如果 G 是具有树宽3的最大图。我们的第一个结果加强了Tuza的结果,这意味着 τG2νG 每一个 ķ8免和弦图 G

更新日期:2021-01-24
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